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Species · Washington · BBS 2025 Release · 1966–2024

Pacific Wren Population Trend in Washington

All statesForest birds

Pacific Wren in Washington has edged up: up 12% on the route-weighted index since 1970.

+12%Since 1970TrendPercent change in the route-weighted abundance index between a smoothed baseline window and the most recent one. It tracks direction, not absolute population.Full methodology →
73Routes In StateSurvey routesHow many standard-protocol BBS routes contributed counts. More routes means a steadier, better-sampled index; very thin coverage is suppressed.Full methodology →
56YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Pacific Wren Trends in WashingtonNotable signalsLong-arc shifts the engine flags automatically — sustained declines or increases large enough to stand out from year-to-year noise.Full methodology →

No notable trend signals for Pacific Wren in Washington. See the full index history below.

Pacific Wren Population Forecast in Washington

If the recent trend holds, Pacific Wren in Washington is projected to stay roughly flat through 2029, near 6.7 (95% range 2.3–11). A 5-year backtest shows a typical error of ±23%, with 100% of held-out values landing inside the 95% band.

-4%Change by 2029TrendPercent change in the route-weighted abundance index between a smoothed baseline window and the most recent one. It tracks direction, not absolute population.Full methodology →
6.7Projected 2029 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
2.3–1195% range95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →
±23%Backtest errorBacktest errorTypical error when we hold out the most recent years, forecast them, and compare to what actually happened. Lower means a more trustworthy projection.Full methodology →
If the recent trend holds, Pacific Wren in Washington is projected to stay roughly flat through 2029, near 6.7 (95% range 2.3–11). A 5-year backtest shows a typical error of ±23%, with 100% of held-out values landing inside the 95% band.19682029
Projection of the recent trend (dashed) with 80/95% bands — a projection, not a prediction. Habitat, climate, and land use are not modeled.
YearProjected indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →95% low95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →95% high95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →
20256.82.411
20266.82.411
20276.82.411
20286.82.311
20296.72.311

Pacific Wren Survey Routes in Washington

Routes recording Pacific Wren in Washington.
Recent countThe raw number of individuals recorded on this route in its most recent survey year. A single-route tally, not a trend.Full methodology →
Glacier5320241975
Mt St Helens5120241992
Neilton3919751975
Cascade Riv3320061988
Taholah3220221969
White Chuck3120241992
Kendall2720241981
Index2719971997
Ozette2520241971
Cedar Falls2520141992
Bunker Hill2320241968
Raymond 22320242022
Index 22120232014
Pe Ell2120231993
Raymond1920211993
Suiattle Riv1820191993
Greenwater1720242015
Montesand1420241986
Cougar1420231968
Ilwaco1420241975
Mt. Adams1420241993
Concrete1320242013
Packwood1220241975
Sullivan Lk1219991999
Mt Rainier1220211990

Pacific Wren Population Trend in Other States

alaskacaliforniaidahomontananevadaoregonsouth-dakota

Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.